This study was supported by resources from the European Fund for Regional Development (EFFRE), the Federal Ministry of Education and Research (ICCAS), the Alfried Krupp von Bohlen and Halbach Foundation, and the German Research Foundation (DFG).

David Victor Kumar Irugu, Heinz R. Stammberger, A Note on the Technical Aspects and Evaluation of the Role of Navigation System in Endoscopic Endonasal Surgeries, Indian Journal of Otolaryngology and Head & Neck Surgery, 2014, 66, S1, 307